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"It is of course very difficult to offer a reliable ID based on the scant description here, but in your case I would guess that the stationary "snowflake-like" animal is a type of hydrozoan jellyfish that have branched tentacles and actually have a small sucker on one branch of the tentacle with which to attach to the wall of the aquarium. They are capable of asexual reproduction under ideal conditions in an aquarium, and can become quite abundant for some time, but usually disappear on their own about as quickly as they appeared in the first place."
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<font size="2" face="Verdana, Helvetica, sans-serif">Rob: Thanks for the great info and link. These are exactly what I have right now, in abundance. It seems the Astraea snails may be mowing a few down as they go over the glass - any concerns with such an addition to their diet?
Cheers,
Alan